Process for monitoring the charge level of a battery, and for in

Details Process for monitoring the charge level of a battery, and for in Process for monitoring the charge level of a battery, and for in

1994-10-31

1997-01-21

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

H01M 1048

Patent

active

055962629

ABSTRACT:
The invention relates to a method of monitoring the state of charge of the battery of a hybrid vehicle, in which the charge level of the battery is determined by balancing the charge quantities extracted and supplied, and is indicated to the driver. Because of the inaccuracy of the charge balancing, resetting of the balancing from a reliable limit value must be carried out from time to time. In order to assist the operator of the hybrid vehicle in monitoring the battery charge level, according to the invention an error variable is calculated which indicates a discrepancy between the indicated charge level and the actual charge level, and the vehicle operator is provided with an indication if this variable exceeds a maximum value. In a representative embodiment, the error variable is set to be proportional to the current through the battery.

REFERENCES:
Schlenter et al., "Ein Gerat zur Ermittlung des Ladezustandes von Bleiakkumulatoren," pp. 82-87. 1983.
British Search Report dated Jan. 6, 1995.

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